Linux Questions & Answers – Shell Redirection

This set of Linux / Unix interview questions and answers focuses on Bash Shell programming & administration. It will be useful for both fresher & experienced preparing interviews on Linux Basics, Essentials and Shell programming.

6. The following commands gives the output like this
#cat file1 file2
#cat: file1: No such file or directory
hello
If we execute the command “cat file1 file2 1>2 2>&1” the output would be
a) cat: file1: No such file or directory hello
b) No output is displayed
c) Cat: 1>2: No such file or directory
d) helloView Answer

Answer:b

7. cat < file1 >> file2 | file3
a) file1 content will be appended to file2 and finally stored in file3
b) file1 content will be appended to file2 and file3 will be ignored
c) file2 and file3 will have same content
d) syntax errorView Answer

Answer:d

8. Executing cat /etc/password > /dev/sda as superuser will
a) Write data into a regular file called /dev/sda
b) Write data to the physical device sda
c) Create a temporary file /dev/sda and write data to it
d) None of the aboveView Answer

Answer:b

9. From where would the read statement read if the following statements were executed?
exec < file1
exec < file2
exec < file3
read line
a) It would read all the files
b) It would not read any files
c) It would read all the files in reverse order
d) It would read only file3View Answer